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/* Remote serial support interface definitions for GDB, the GNU Debugger.
Copyright (C) 1992-2021 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <>. */
#ifndef SERIAL_H
#define SERIAL_H
#ifdef USE_WIN32API
#include <winsock2.h>
#include <windows.h>
struct ui_file;
/* For most routines, if a failure is indicated, then errno should be
examined. */
/* Terminal state pointer. This is specific to each type of
interface. */
typedef void *serial_ttystate;
struct serial;
struct serial_ops;
/* Speed in bits per second, or -1 which means don't mess with the speed. */
extern int baud_rate;
/* Parity for serial port */
extern int serial_parity;
/* Create a new serial for OPS. The new serial is not opened. */
/* Try to open NAME. Returns a new `struct serial *' on success, NULL
on failure. The new serial object has a reference count of 1.
Note that some open calls can block and, if possible, should be
written to be non-blocking, with calls to ui_look_hook so they can
be cancelled. An async interface for open could be added to GDB if
necessary. */
extern struct serial *serial_open (const char *name);
/* Open a new serial stream using OPS. */
extern struct serial *serial_open_ops (const struct serial_ops *ops);
/* Returns true if SCB is open. */
extern int serial_is_open (struct serial *scb);
/* Find an already opened serial stream using a file handle. */
extern struct serial *serial_for_fd (int fd);
/* Open a new serial stream using a file handle. */
extern struct serial *serial_fdopen (const int fd);
/* Push out all buffers, close the device and unref SCB. */
extern void serial_close (struct serial *scb);
/* Increment reference count of SCB. */
extern void serial_ref (struct serial *scb);
/* Decrement reference count of SCB. */
extern void serial_unref (struct serial *scb);
/* Create a pipe, and put the read end in FILDES[0], and the write end
in FILDES[1]. Returns 0 for success, negative value for error (in
which case errno contains the error). */
extern int gdb_pipe (int fildes[2]);
/* Create a pipe with each end wrapped in a `struct serial' interface.
Put the read end in scbs[0], and the write end in scbs[1]. Returns
0 for success, negative value for error (in which case errno
contains the error). */
extern int serial_pipe (struct serial *scbs[2]);
/* Push out all buffers and destroy SCB without closing the device. */
extern void serial_un_fdopen (struct serial *scb);
/* Read one char from the serial device with TIMEOUT seconds to wait
or -1 to wait forever. Use timeout of 0 to effect a poll.
Infinite waits are not permitted. Returns unsigned char if ok, else
one of the following codes. Note that all error return-codes are
guaranteed to be < 0. */
enum serial_rc {
SERIAL_ERROR = -1, /* General error. */
SERIAL_TIMEOUT = -2, /* Timeout or data-not-ready during read.
Unfortunately, through
deprecated_ui_loop_hook (), this can also
be a QUIT indication. */
SERIAL_EOF = -3 /* General end-of-file or remote target
connection closed, indication. Includes
things like the line dropping dead. */
extern int serial_readchar (struct serial *scb, int timeout);
/* Write COUNT bytes from BUF to the port SCB. Returns 0 for
success, non-zero for failure. */
extern int serial_write (struct serial *scb, const void *buf, size_t count);
/* Write a printf style string onto the serial port. */
extern void serial_printf (struct serial *desc,
const char *,...) ATTRIBUTE_PRINTF (2, 3);
/* Allow pending output to drain. */
extern int serial_drain_output (struct serial *);
/* Flush (discard) pending output. Might also flush input (if this
system can't flush only output). */
extern int serial_flush_output (struct serial *);
/* Flush pending input. Might also flush output (if this system can't
flush only input). */
extern int serial_flush_input (struct serial *);
/* Send a break between 0.25 and 0.5 seconds long. */
extern int serial_send_break (struct serial *scb);
/* Turn the port into raw mode. */
extern void serial_raw (struct serial *scb);
/* Return a pointer to a newly malloc'd ttystate containing the state
of the tty. */
extern serial_ttystate serial_get_tty_state (struct serial *scb);
/* Return a pointer to a newly malloc'd ttystate containing a copy
of the state in TTYSTATE. */
extern serial_ttystate serial_copy_tty_state (struct serial *scb,
serial_ttystate ttystate);
/* Set the state of the tty to TTYSTATE. The change is immediate.
When changing to or from raw mode, input might be discarded.
Returns 0 for success, negative value for error (in which case
errno contains the error). */
extern int serial_set_tty_state (struct serial *scb, serial_ttystate ttystate);
/* printf_filtered a user-comprehensible description of ttystate on
the specified STREAM. FIXME: At present this sends output to the
default stream - GDB_STDOUT. */
extern void serial_print_tty_state (struct serial *scb,
serial_ttystate ttystate,
struct ui_file *);
/* Set the baudrate to the decimal value supplied. Returns 0 for
success, -1 for failure. */
extern int serial_setbaudrate (struct serial *scb, int rate);
/* Set the number of stop bits to the value specified. Returns 0 for
success, -1 for failure. */
#define SERIAL_1_AND_A_HALF_STOPBITS 2 /* 1.5 bits, snicker... */
extern int serial_setstopbits (struct serial *scb, int num);
/* Set parity for serial port. Returns 0 for success, -1 for failure. */
extern int serial_setparity (struct serial *scb, int parity);
/* Asynchronous serial interface: */
/* Can the serial device support asynchronous mode? */
extern int serial_can_async_p (struct serial *scb);
/* Has the serial device been put in asynchronous mode? */
extern int serial_is_async_p (struct serial *scb);
/* For ASYNC enabled devices, register a callback and enable
asynchronous mode. To disable asynchronous mode, register a NULL
callback. */
typedef void (serial_event_ftype) (struct serial *scb, void *context);
extern void serial_async (struct serial *scb,
serial_event_ftype *handler, void *context);
/* Trace/debug mechanism.
serial_debug() enables/disables internal debugging.
serial_debug_p() indicates the current debug state. */
extern void serial_debug (struct serial *scb, int debug_p);
extern int serial_debug_p (struct serial *scb);
/* Details of an instance of a serial object. */
struct serial
/* serial objects are ref counted (but not the underlying
connection, just the object's lifetime in memory). */
int refcnt;
int fd; /* File descriptor */
/* File descriptor for a separate error stream that should be
immediately forwarded to gdb_stderr. This may be -1.
If != -1, this descriptor should be non-blocking or
ops->avail should be non-NULL. */
int error_fd;
const struct serial_ops *ops; /* Function vector */
void *state; /* Local context info for open FD */
serial_ttystate ttystate; /* Not used (yet) */
int bufcnt; /* Amount of data remaining in receive
buffer. -ve for sticky errors. */
unsigned char *bufp; /* Current byte */
unsigned char buf[BUFSIZ]; /* Da buffer itself */
char *name; /* The name of the device or host */
struct serial *next; /* Pointer to the next `struct serial *' */
int debug_p; /* Trace this serial devices operation. */
int async_state; /* Async internal state. */
void *async_context; /* Async event thread's context */
serial_event_ftype *async_handler;/* Async event handler */
struct serial_ops
const char *name;
int (*open) (struct serial *, const char *name);
void (*close) (struct serial *);
int (*fdopen) (struct serial *, int fd);
int (*readchar) (struct serial *, int timeout);
int (*write) (struct serial *, const void *buf, size_t count);
/* Discard pending output */
int (*flush_output) (struct serial *);
/* Discard pending input */
int (*flush_input) (struct serial *);
int (*send_break) (struct serial *);
void (*go_raw) (struct serial *);
serial_ttystate (*get_tty_state) (struct serial *);
serial_ttystate (*copy_tty_state) (struct serial *, serial_ttystate);
int (*set_tty_state) (struct serial *, serial_ttystate);
void (*print_tty_state) (struct serial *, serial_ttystate,
struct ui_file *);
int (*setbaudrate) (struct serial *, int rate);
int (*setstopbits) (struct serial *, int num);
/* Set the value PARITY as parity setting for serial object.
Return 0 in the case of success. */
int (*setparity) (struct serial *, int parity);
/* Wait for output to drain. */
int (*drain_output) (struct serial *);
/* Change the serial device into/out of asynchronous mode, call
the specified function when ever there is something
interesting. */
void (*async) (struct serial *scb, int async_p);
/* Perform a low-level read operation, reading (at most) COUNT
bytes into SCB->BUF. Return zero at end of file. */
int (*read_prim)(struct serial *scb, size_t count);
/* Perform a low-level write operation, writing (at most) COUNT
bytes from BUF. */
int (*write_prim)(struct serial *scb, const void *buf, size_t count);
/* Return that number of bytes that can be read from FD
without blocking. Return value of -1 means that the
read will not block even if less that requested bytes
are available. */
int (*avail)(struct serial *scb, int fd);
#ifdef USE_WIN32API
/* Return a handle to wait on, indicating available data from SCB
when signaled, in *READ. Return a handle indicating errors
in *EXCEPT. */
void (*wait_handle) (struct serial *scb, HANDLE *read, HANDLE *except);
void (*done_wait_handle) (struct serial *scb);
#endif /* USE_WIN32API */
/* Add a new serial interface to the interface list. */
extern void serial_add_interface (const struct serial_ops * optable);
/* File in which to record the remote debugging session. */
extern void serial_log_command (struct target_ops *self, const char *);
#ifdef USE_WIN32API
/* Windows-only: find or create handles that we can wait on for this
serial device. */
extern void serial_wait_handle (struct serial *, HANDLE *, HANDLE *);
/* Windows-only: signal that we are done with the wait handles. */
extern void serial_done_wait_handle (struct serial *);
#endif /* USE_WIN32API */
#endif /* SERIAL_H */